code.delx.au - pulseaudio/blob - src/pulsecore/atomic.h

   1 #ifndef foopulseatomichfoo
   2 #define foopulseatomichfoo
   3
   4 /* $Id$ */
   5
   6 /***
   7   This file is part of PulseAudio.
   8
   9   Copyright 2006 Lennart Poettering
  10
  11   PulseAudio is free software; you can redistribute it and/or modify
  12   it under the terms of the GNU Lesser General Public License as
  13   published by the Free Software Foundation; either version 2 of the
  14   License, or (at your option) any later version.
  15
  16   PulseAudio is distributed in the hope that it will be useful, but
  17   WITHOUT ANY WARRANTY; without even the implied warranty of
  18   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  19   General Public License for more details.
  20
  21   You should have received a copy of the GNU Lesser General Public
  22   License along with PulseAudio; if not, write to the Free Software
  23   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  24   USA.
  25 ***/
  26
  27 #include <atomic_ops.h>
  28
  29 /* atomic_ops guarantees us that sizeof(AO_t) == sizeof(void*).
  30  *
  31  * It is not guaranteed however, that sizeof(AO_t) == sizeof(size_t).
  32  * however very likely. */
  33
  34 typedef struct pa_atomic_int {
  35     volatile AO_t value;
  36 } pa_atomic_int_t;
  37
  38 #define PA_ATOMIC_INIT(v) { .value = (v) }
  39
  40 /* For now we do only full memory barriers. Eventually we might want
  41  * to support more elaborate memory barriers, in which case we will add
  42  * suffixes to the function names */
  43
  44 static inline int pa_atomic_load(const pa_atomic_int_t *a) {
  45     return (int) AO_load_full((AO_t*) &a->value);
  46 }
  47
  48 static inline void pa_atomic_store(pa_atomic_int_t *a, int i) {
  49     AO_store_full(&a->value, (AO_t) i);
  50 }
  51
  52 static inline int pa_atomic_add(pa_atomic_int_t *a, int i) {
  53     return AO_fetch_and_add_full(&a->value, (AO_t) i);
  54 }
  55
  56 static inline int pa_atomic_sub(pa_atomic_int_t *a, int i) {
  57     return AO_fetch_and_add_full(&a->value, (AO_t) -i);
  58 }
  59
  60 static inline int pa_atomic_inc(pa_atomic_int_t *a) {
  61     return AO_fetch_and_add1_full(&a->value);
  62 }
  63
  64 static inline int pa_atomic_dec(pa_atomic_int_t *a) {
  65     return AO_fetch_and_sub1_full(&a->value);
  66 }
  67
  68 static inline int pa_atomic_cmpxchg(pa_atomic_int_t *a, int old_i, int new_i) {
  69     return AO_compare_and_swap_full(&a->value, old_i, new_i);
  70 }
  71
  72 typedef struct pa_atomic_ptr {
  73     volatile AO_t value;
  74 } pa_atomic_ptr_t;
  75
  76 static inline void* pa_atomic_ptr_load(const pa_atomic_ptr_t *a) {
  77     return (void*) AO_load_full((AO_t*) &a->value);
  78 }
  79
  80 static inline void pa_atomic_ptr_store(pa_atomic_ptr_t *a, void *p) {
  81     AO_store_full(&a->value, (AO_t) p);
  82 }
  83
  84 static inline int pa_atomic_ptr_cmpxchg(pa_atomic_ptr_t *a, void *old_p, void* new_p) {
  85     return AO_compare_and_swap_full(&a->value, (AO_t) old_p, (AO_t) new_p);
  86 }
  87
  88 #endif